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Title:
Multiple scattering in reflection nebulae. I - A Monte Carlo approach.
Authors:
Witt, A. N.
Affiliation:
AA(Toledo, University, Toledo, Ohio; Colorado, University, Boulder, Colo.)
Publication:
Astrophysical Journal Supplement Series, vol. 35, Sept. 1977, p. 1-6. (ApJS Homepage)
Publication Date:
09/1977
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astronomical Models, Interstellar Matter, Light Scattering, Monte Carlo Method, Nebulae, Radiative Transfer, Albedo, Backscattering, Optical Reflection, Optical Thickness, Photons
DOI:
10.1086/190463
Bibliographic Code:
1977ApJS...35....1W

Abstract

A method for calculating the surface brightness distribution on a plane-parallel reflection nebula of uniform density illuminated by a star located either in front of, behind, or arbitrarily inside the scattering medium is proposed. The Monte Carlo technique is used to find solutions to the radiative transfer problem. The scattering properties of the nebular particles are parameterized by the albedo for single scattering and a three-parameter analytic phase function. Calculations are then presented for the surface brightness distribution across the face of such nebulae with (1) a foreground star and (2) immersed stars. The calculations include the full effects of multiple scattering, are independent of a particular assumed grain material or size distribution, and are applicable to any wavelength region for which observations can be obtained.

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